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Electron states in quantum rings with structural distortions under axial or in-plane magnetic fields

Planelles, J. and Rajadell, F. and Climente, J. I. (2007) Electron states in quantum rings with structural distortions under axial or in-plane magnetic fields. NANOTECHNOLOGY, 18 (37).

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Official URL: http://www.iop.org/EJ/abstract/0957-4484/18/37/375...

Abstract

A comprehensive study of anisotropic quantum rings, QRs, subject to axial and in- plane magnetic field, both aligned and transverse to the anisotropy direction, is carried out. Elliptical QRs for a wide range of eccentricity values and also perfectly circular QRs including one or more barriers disturbing the QR current are considered. These models mimic anisotropic geometry deformations and mass diffusion occurring in the QR fabrication process. Symmetry considerations and simplified analytical models supply physical insight into the obtained numerical results. Our study demonstrates that, except for unusual extremely large eccentricities, QR geometry deformations only appreciably influence a few low- lying states, while the effect of barriers disturbing the QR current is stronger and affects all studied states to a similar extent. We also show that the response of the electron states to in- plane magnetic fields provides accurate information on the structural anisotropy.

Item Type:Article
Uncontrolled Keywords:FAR-INFRARED SPECTROSCOPY; SEMICONDUCTOR RINGS; CONFINED STATES; ENERGY-LEVELS; DOTS; OSCILLATIONS; NANORINGS; STORAGE; INP
Subjects:Physical Science > Quantum phenomena
ID Code:6347
Deposited By:IoN
Deposited On:28 Sep 2009 12:20
Last Modified:28 Sep 2009 12:20

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